621
FNCA52 TJSJ 171930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST FRI APR 17 2026
DISCUSSION
NO FIRE DANGER IS EXPECTED TODAY.
PRZ014-180800-
SOUTHEAST COASTAL PLAINS-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 50 10 0
TEMP (24H TREND) 70 (-2) 87 (+2) 69 87
RH % (24H TREND) 90 (0) 53 (-6) 90 52
WIND 20FT/EARLY(MPH) E 12 E 14 NE 12 E 14
WIND 20FT/LATE(MPH) NE 9 E 16 NE 10 E 17
MIXING HGT(FT-AGL/MSL) 4490 4930
TRANSPORT WND (MPH) E 12 E 12
VENT RATE (KT-FT) 44900 49300
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-180800-
SOUTHERN HILLS-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 70 10 10
TEMP (24H TREND) 66 (-3) 83 (+3) 66 83
RH % (24H TREND) 98 (+5) 67 (-6) 97 64
WIND 20FT/EARLY(MPH) E 11 E 10 NE 11 E 11
WIND 20FT/LATE(MPH) E 11 E 11 NE 10 E 12
MIXING HGT(FT-AGL/MSL) 5450 5550
TRANSPORT WND (MPH) E 10 E 10
VENT RATE (KT-FT) 49050 49950
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-180800-
NORTH COASTAL PLAINS-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 20 10
TEMP (24H TREND) 69 (-2) 86 (+1) 69 86
RH % (24H TREND) 100 (+3) 63 (-6) 98 62
WIND 20FT/EARLY(MPH) E 12 E 12 E 16 E 12
WIND 20FT/LATE(MPH) E 11 E 16 E 13 E 16
MIXING HGT(FT-AGL/MSL) 4370 4270
TRANSPORT WND (MPH) E 13 E 14
VENT RATE (KT-FT) 48070 51240
DISPERSION 5 5
DSI 6 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-180800-
NORTHERN HILLS-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 60 10 30
TEMP (24H TREND) 67 (-2) 85 (+2) 67 84
RH % (24H TREND) 99 (+2) 67 (-3) 98 65
WIND 20FT/EARLY(MPH) E 10 E 11 E 13 E 11
WIND 20FT/LATE(MPH) E 9 E 13 E 10 E 13
MIXING HGT(FT-AGL/MSL) 5380 5200
TRANSPORT WND (MPH) E 9 E 10
VENT RATE (KT-FT) 43040 46800
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-180800-
WEST COAST-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 70 20 50
TEMP (24H TREND) 69 (-2) 87 (0) 68 86
RH % (24H TREND) 97 (+4) 63 (-3) 97 63
WIND 20FT/EARLY(MPH) E 9 E 11 E 16 E 9
WIND 20FT/LATE(MPH) E 10 E 11 E 13 E 10
MIXING HGT(FT-AGL/MSL) 4860 4780
TRANSPORT WND (MPH) E 7 E 6
VENT RATE (KT-FT) 29160 23900
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-180800-
EASTERN INTERIOR-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 50 30 20
TEMP (24H TREND) 68 (-2) 83 (+1) 67 84
RH % (24H TREND) 99 (+2) 66 (-6) 97 64
WIND 20FT/EARLY(MPH) E 13 E 12 E 12 E 12
WIND 20FT/LATE(MPH) E 12 E 11 E 12 E 12
MIXING HGT(FT-AGL/MSL) 4560 4510
TRANSPORT WND (MPH) E 12 E 12
VENT RATE (KT-FT) 45600 45100
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-180800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 70 50 50 20
TEMP (24H TREND) 66 (-3) 79 (+1) 65 80
RH % (24H TREND) 100 (+1) 70 (-7) 100 69
WIND 20FT/EARLY(MPH) E 10 E 10 E 9 E 10
WIND 20FT/LATE(MPH) E 9 E 10 E 9 E 10
MIXING HGT(FT-AGL/MSL) 3490 3590
TRANSPORT WND (MPH) E 13 E 15
VENT RATE (KT-FT) 38390 46670
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-180800-
CENTRAL MOUNTAIN RANGE-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 80 10 30
TEMP (24H TREND) 64 (-3) 82 (+3) 64 81
RH % (24H TREND) 99 (+4) 69 (-4) 98 67
WIND 20FT/EARLY(MPH) E 6 E 8 E 11 E 8
WIND 20FT/LATE(MPH) E 8 E 8 E 9 E 9
MIXING HGT(FT-AGL/MSL) 6170 5970
TRANSPORT WND (MPH) E 7 E 7
VENT RATE (KT-FT) 37020 35820
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-180800-
CAYEY MOUNTAIN RANGE-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 40 30 10
TEMP (24H TREND) 67 (-2) 78 (0) 66 80
RH % (24H TREND) 100 (+1) 72 (-6) 100 70
WIND 20FT/EARLY(MPH) E 10 E 9 E 9 E 9
WIND 20FT/LATE(MPH) E 9 E 10 E 8 E 11
MIXING HGT(FT-AGL/MSL) 3870 3950
TRANSPORT WND (MPH) E 13 E 13
VENT RATE (KT-FT) 42570 43450
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-180800-
VIEQUES-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 70 60 50 20
TEMP (24H TREND) 72 (-1) 85 (0) 72 86
RH % (24H TREND) 91 (-2) 60 (-4) 89 59
WIND 20FT/EARLY(MPH) E 17 E 16 E 16 E 14
WIND 20FT/LATE(MPH) E 17 E 13 E 16 E 14
MIXING HGT(FT-AGL/MSL) 3240 3390
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 45360 50850
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-180800-
CULEBRA-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 70 60 40 20
TEMP (24H TREND) 74 (-1) 87 (+1) 73 87
RH % (24H TREND) 92 (+2) 59 (-6) 90 59
WIND 20FT/EARLY(MPH) E 17 E 16 E 16 E 14
WIND 20FT/LATE(MPH) E 17 E 14 E 16 E 14
MIXING HGT(FT-AGL/MSL) 3250 3810
TRANSPORT WND (MPH) E 16 E 18
VENT RATE (KT-FT) 45500 60960
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-180800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 10 20
TEMP (24H TREND) 70 (-2) 88 (+2) 68 87
RH % (24H TREND) 91 (+2) 52 (-5) 93 51
WIND 20FT/EARLY(MPH) E 11 E 16 E 10 E 12
WIND 20FT/LATE(MPH) E 12 E 16 E 10 E 14
MIXING HGT(FT-AGL/MSL) 5100 5440
TRANSPORT WND (MPH) E 13 E 9
VENT RATE (KT-FT) 56100 43520
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-180800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 60 40 20
TEMP (24H TREND) 73 (-3) 85 (+1) 72 86
RH % (24H TREND) 92 (+5) 59 (-6) 91 58
WIND 20FT/EARLY(MPH) E 17 E 16 E 17 E 17
WIND 20FT/LATE(MPH) E 17 E 14 E 17 E 14
MIXING HGT(FT-AGL/MSL) 3350 3770
TRANSPORT WND (MPH) E 18 E 21
VENT RATE (KT-FT) 53600 67860
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-180800-
ST CROIX-
330 PM AST FRI APR 17 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 60 40 20
TEMP (24H TREND) 72 (-3) 86 (+1) 72 87
RH % (24H TREND) 94 (+4) 60 (-6) 90 60
WIND 20FT/EARLY(MPH) E 16 E 16 E 16 E 16
WIND 20FT/LATE(MPH) E 16 E 13 E 16 E 16
MIXING HGT(FT-AGL/MSL) 3920 3850
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 62720 61600
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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